Below is a box at rest on the floor with some friction.
What would I have to do to get it to accelerate uniformly?
Where FA  F fk

F fk

FA
Below is a box at rest on the floor with some friction.
What would I have to do to get it to accelerate uniformly?
Where FA  F fk

F fk

FA
Therefore objects accelerate when a net force is applied.


Fnet  ma Newton’s 2nd Law!
How do I get the lab equipment to angularly accelerate?

F
How do I get the lab equipment to angularly accelerate?

F
The force provides a net torque that causes an angular acceleration.
Newton’s Second Law for Rotation Lab
What factors would affect the angular acceleration?
Torque
Something about the mass
Purpose: To create graphical and mathematical representations of
the relationship between the torque and the angular
acceleration for a system with constant mass.
Angular
Acceleration
Newton’s Second Law for Rotation Lab
  rF sin 
  rFT
r  radius of the pulley
F  FT in the string
  90
r
The clamp-on Super Pulley must be
adjusted at an angle, so that the thread
runs in a line tangent to the point where it
leaves the 3-step Pulley and straight down
the middle of the groove on the clamp-on
Super Pulley (Figure 1.2).
Newton’s Second Law for Rotation Lab
  rF sin 
  rFT
r  radius of the pulley
F  FT in the string
Fg  FT

FT


F

m
a
 y
y
  90

To find a
Since the string doesn’t slip, the
linear acceleration of the masses is
equal to the tangential acceleration
of the outside of the pulley.
aof the masses  at of the pulley
at   r
Since the masses
are accelerating
downward.

Fg
FT  Fg  ma
FT  Fg  ma
FT  mg  ma
FT  m g  a 